Suppose a particular star has a core that is undergoing several stages of fusion simultaneously, as shown in this diagram. Based on our understanding of stellar lives, the mass of this star is probably
A) greater than 8 times the mass of the Sun.
B) about 2 times the mass of the Sun.
C) about the same mass as the Sun.
D) less than 0.1 times the mass of the Sun.
A) greater than 8 times the mass of the Sun.
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An aircraft approaches a runway that runs directly east as a strong wind blows out of the south. The direction that the aircraft should aim in order to land is east of north
a. True b. False Indicate whether the statement is true or false
In ?- decay, the number of protons in the nucleus is
A) decreased by 1. B) decreased by 2. C) increased by 1. D) increased by 2. E) remains unchanged.
A cylinder containing an ideal gas has a volume of 3.0 m3 and a pressure of 1.0 × 10^5 Pa at a temperature of 300 K. The cylinder is placed against a metal block that is maintained at 900 K and the gas expands as the pressure remains constant until the temperature of the gas reaches 900 K. The change in internal energy of the gas is 9.0 × 10^5 J. Find the change in entropy of the block
associated with the heat transfer to the gas. a. 0 c. -1700 J/K b. +670 J/K d. -1100 J/K
A child pulls a 3.00-kg sled across level ground at constant velocity with a light rope that makes an angle 34.0° above horizontal
The tension in the rope is 5.00 N. Assuming the acceleration of gravity is 9.81 m/s2, what is the coefficient of friction between the sled and the ground? A) 0.156 B) 0.188 C) 0.0441 D) 0.0851 E) 0.103